Mneme World Generator
Mneme World Generator
The Mneme World Generator is a set of variant rules for the Cepheus Engine tabletop RPG system, designed to generate detailed solar systems, worlds, inhabitants, and societies for science fiction settings. It is derived from the Traveller System Reference Document and other Open Gaming Content.
Authors: Justin Cesar Aquino, Niccolo Salonga
Proofreading: Niccolo Salonga
Art: Niccolo Salonga
World Generation Spreadsheet: John Karol Abayan, Lloyd Reyes, Ranz Sapinit, Michael Ibanez, Christine Melody Taa
Supporting Material
- World Generator Spreadsheet (Automatic Solar System Generation)
- How to use the World Generator Spreadsheet
- OGL Document (Google Drive)
Legal Notice
Cepheus Engine and Samardan Press are trademarks of Jason "Flynn" Kemp.
This product is derived from the Traveller System Reference Document and other Open Gaming Content made available by the Open Gaming License. These are Variant Rules, specifically called the Mneme Variant Rules. Please credit the Mneme Variant Rules when deriving content from this work.
Core Rulebook
| # | Chapter | Description |
|---|---|---|
| 0 | Front Matter & Credits | Credits, acknowledgements, legal notices, and supporting links |
| 1 | Chapter 1: Definitions | Earth-centric and Mneme definitions, stellar classifications, world types, size classes, atmospheres, and all key terms |
| 2 | Chapter 2: Minor Mechanics | Advantage/Disadvantage rules and other minor mechanical variants |
| 3 | Chapter 3: Mneme World Generator Overview | Introduction to the world generation system |
| 4 | Chapter 4: Determine Star | Stellar class, mass, luminosity, companion stars, zones, limits, and tech level tables |
| 5 | Chapter 5: Determine Main World | World type, habitat worlds, dwarf planets, terrestrial worlds, gravity determination |
| 6 | Chapter 6: Determine Habitability | Atmospheric pressure, temperature, hazards, biochemical resources, habitability modifiers |
| 7 | Chapter 7: Determine Position (Main World) | Terrestrial world qualities, main world position tables |
| 8 | Chapter 8: Determine Inhabitants | Population, wealth, power structures, development, governance, sources of power, travel zones, starports |
| 9 | Chapter 9: Determine Planetary System | Full planetary system generation, planetary positions, disk zones, asteroid types, gas world types |
| 10 | Appendix | Administrative rolls, legal rolls, influencing attitudes, credit values, radiation exposure, vacc suits, hazmat suits, technology level definitions (TL0–TL16), culture table, hex map instructions |
| 11 | Open Game License (OGL) | Full Open Game License text and Section 15 copyright notices |
Supplemental Documents
| Document | Date | Description |
|---|---|---|
| Ships & Star Systems – Master Equation Sheet | Oct 2025 | Master reference sheet covering ship and star system equations and calculations |
| World Generator PWA v04 | Oct 2025 | Progressive Web App design document for the Mneme World Generator, version 04 |
| World Generator PWA (Dec 2025) | Dec 2025 | Updated PWA specification and notes, December 2025 |
| PWA Challenges & Notes | Jan 2026 | Known challenges and design notes for the World Generator PWA |
| Logic Specification (Feb 02 2026) | Feb 2026 | Detailed logic specification for Mneme World Generator implementation |
| Logic Specification (Feb 22 2026) | Feb 2026 | Latest revision of the Mneme logic specification |